EQUILIBRIA IN AQUEOUS SOLUTION BETWEEN BERYLLIUM(II) AND ORTHO-PHENYLENEDIAMINE-N,N,N′,N′-TETRAACETIC, 3,4-TOLUENEDIAMINE-N,N,N′,N′-TETRAACETIC AND 4-CHLORO-1,2-PHENYLENEDIAMINE-N,N,N′,N′-TETRAACETIC ACIDS

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Abstract
The complex species formed in aqueous solution between Be(II) and ortho-phenylenediamine-N,N,N′,N′-tetraacetic acid (o-PDTA). 3,4-toluenediamine-N,N,N′,N′-tetraacetic acid (3,4-TDTA) and 4-chloro-1,2-phenylenediamine-N,N,N′,N′-tetraacetic acid(4-Cl-o-PDTA) were studied at 25° and ionic strength 0.5 M in NaClO4. The application of the program LETAGROP to the experimental potentiometric data, taking into account hydrolysis of the ion Be(II), indicates that, upon varying the ligand/metal relationships, only the complexes BeHC− and BeC2- (ligands. H4C) are formed in significant amounts for the three systems studied, in an analogous manner to EDTA. the nitrogen atom conformation of which is similar.